English

Scalar Field Dark Matter: non-spherical collapse and late time behavior

Astrophysics 2009-11-11 v1 General Relativity and Quantum Cosmology High Energy Physics - Theory

Abstract

We show the evolution of non-spherically symmetric balls of a self-gravitating scalar field in the Newtonian regime or equivalently an ideal self-gravitating condensed Bose gas. In order to do so, we use a finite differencing approximation of the Shcr\"odinger-Poisson (SP) system of equations with axial symmetry in cylindrical coordinates. Our results indicate: 1) that spherically symmetric ground state equilibrium configurations are stable against non-spherical perturbations and 2) that such configurations of the SP system are late-time attractors for non-spherically symmetric initial profiles of the scalar field, which is a generalization of such behavior for spherically symmetric initial profiles. Our system and the boundary conditions used, work as a model of scalar field dark matter collapse after the turnaround point. In such case, we have found that the scalar field overdensities tolerate non-spherical contributions to the profile of the initial fluctuation.

Keywords

Cite

@article{arxiv.astro-ph/0608523,
  title  = {Scalar Field Dark Matter: non-spherical collapse and late time behavior},
  author = {Argelia Bernal and F. Siddhartha Guzman},
  journal= {arXiv preprint arXiv:astro-ph/0608523},
  year   = {2009}
}

Comments

8 revtex pages, 10 eps figures. Accepted for publication in PRD